import 'package:flutter/material.dart';

class MyApp17 extends StatelessWidget {
  const MyApp17({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //导航条
      appBar: AppBar(
        title: const Text(
          'GridView初体验',
          style: TextStyle(color: Colors.white, fontSize: 20),
        ),
        backgroundColor: Colors.pink,
        centerTitle: true,
      ),
      //主体区域
      //侧轴方向上的个数是固定的（无论是否旋转屏幕）
      body: GridView(
        //视图代理
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
          //设置侧轴的个数
          crossAxisCount: 3,
          //设置主轴的间距
          mainAxisSpacing: 10,
          //设置侧轴的间距
          crossAxisSpacing: 10,
          //设置宽高比
          childAspectRatio: 4 / 3,
        ),
        //
        children: [
          Container(
            color: Colors.green,
            alignment: Alignment.center,
            child: const Text('黑马程序员1'),
          ),
          Container(
            color: Colors.pink,
            alignment: Alignment.center,
            child: const Text('黑马程序员2'),
          ),
          Container(
            color: Colors.blue,
            alignment: Alignment.center,
            child: const Text('黑马程序员3'),
          ),
          Container(
            color: Colors.yellow,
            alignment: Alignment.center,
            child: const Text('黑马程序员4'),
          ),
          Container(
            color: Colors.cyan,
            alignment: Alignment.center,
            child: const Text('黑马程序员5'),
          ),
          Container(
            color: Colors.green,
            alignment: Alignment.center,
            child: const Text('黑马程序员6'),
          ),
        ],
      ),
    );
  }
}
